@nekomajin I also would love to see built-in content and most importantly tracker blocker, like in Brave browser or Firefox Focus (laset one is for android I know).

I think it would also be very important to do this Vivaldi-Shield(?) like it's done in Brave, meaning show number of blocked trackers, ads & https upgrades when clicking that Vivaldi-Shield icon.

BUT

Not only at there, the idea of showing summary of blocked trackers, ads, https upgrades & estimated time saving at new tab page right above the quick access icons should also be coby from Brave.

Why copy some idea? Seriously do a twitter search about Brave. One thing you immediately notice is how it protects from trackers. There are tons of screenshots of those summaries about blocked trackers. If that doesn't give you good first impression, I don't know what would.

Also one thing common for both Brave & Firefox Focus is, that both of those protects from tracker right after installation, no need to add anything. Sure, give power users option to remove that Vivaldi-Shield (as easily as possible) and add whatever they want to, but in my opinion that summary alone is great way to promote Vivaldi, so is including protection. And not only for promotion, but privacy is good starting point always.

As I noticed in Opera that site loading times are indeed drastically reduced with a build-in ad blocker compared to AdBlockPlus or similar extensions, I'm definitely in favor of such a feature.
Wouldn't even need much of a GUI as it's not about comfort of use but merely performance.